1 /* 2 * Bridge netlink control interface 3 * 4 * Authors: 5 * Stephen Hemminger <shemminger@osdl.org> 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/slab.h> 15 #include <linux/etherdevice.h> 16 #include <net/rtnetlink.h> 17 #include <net/net_namespace.h> 18 #include <net/sock.h> 19 #include <net/switchdev.h> 20 #include <uapi/linux/if_bridge.h> 21 22 #include "br_private.h" 23 #include "br_private_stp.h" 24 25 static int br_get_num_vlan_infos(const struct net_port_vlans *pv, 26 u32 filter_mask) 27 { 28 u16 vid_range_start = 0, vid_range_end = 0; 29 u16 vid_range_flags = 0; 30 u16 pvid, vid, flags; 31 int num_vlans = 0; 32 33 if (filter_mask & RTEXT_FILTER_BRVLAN) 34 return pv->num_vlans; 35 36 if (!(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) 37 return 0; 38 39 /* Count number of vlan info's 40 */ 41 pvid = br_get_pvid(pv); 42 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { 43 flags = 0; 44 if (vid == pvid) 45 flags |= BRIDGE_VLAN_INFO_PVID; 46 47 if (test_bit(vid, pv->untagged_bitmap)) 48 flags |= BRIDGE_VLAN_INFO_UNTAGGED; 49 50 if (vid_range_start == 0) { 51 goto initvars; 52 } else if ((vid - vid_range_end) == 1 && 53 flags == vid_range_flags) { 54 vid_range_end = vid; 55 continue; 56 } else { 57 if ((vid_range_end - vid_range_start) > 0) 58 num_vlans += 2; 59 else 60 num_vlans += 1; 61 } 62 initvars: 63 vid_range_start = vid; 64 vid_range_end = vid; 65 vid_range_flags = flags; 66 } 67 68 if (vid_range_start != 0) { 69 if ((vid_range_end - vid_range_start) > 0) 70 num_vlans += 2; 71 else 72 num_vlans += 1; 73 } 74 75 return num_vlans; 76 } 77 78 static size_t br_get_link_af_size_filtered(const struct net_device *dev, 79 u32 filter_mask) 80 { 81 struct net_port_vlans *pv; 82 int num_vlan_infos; 83 84 rcu_read_lock(); 85 if (br_port_exists(dev)) 86 pv = nbp_get_vlan_info(br_port_get_rcu(dev)); 87 else if (dev->priv_flags & IFF_EBRIDGE) 88 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev)); 89 else 90 pv = NULL; 91 if (pv) 92 num_vlan_infos = br_get_num_vlan_infos(pv, filter_mask); 93 else 94 num_vlan_infos = 0; 95 rcu_read_unlock(); 96 97 if (!num_vlan_infos) 98 return 0; 99 100 /* Each VLAN is returned in bridge_vlan_info along with flags */ 101 return num_vlan_infos * nla_total_size(sizeof(struct bridge_vlan_info)); 102 } 103 104 static inline size_t br_port_info_size(void) 105 { 106 return nla_total_size(1) /* IFLA_BRPORT_STATE */ 107 + nla_total_size(2) /* IFLA_BRPORT_PRIORITY */ 108 + nla_total_size(4) /* IFLA_BRPORT_COST */ 109 + nla_total_size(1) /* IFLA_BRPORT_MODE */ 110 + nla_total_size(1) /* IFLA_BRPORT_GUARD */ 111 + nla_total_size(1) /* IFLA_BRPORT_PROTECT */ 112 + nla_total_size(1) /* IFLA_BRPORT_FAST_LEAVE */ 113 + nla_total_size(1) /* IFLA_BRPORT_LEARNING */ 114 + nla_total_size(1) /* IFLA_BRPORT_UNICAST_FLOOD */ 115 + nla_total_size(1) /* IFLA_BRPORT_PROXYARP */ 116 + nla_total_size(1) /* IFLA_BRPORT_PROXYARP_WIFI */ 117 + 0; 118 } 119 120 static inline size_t br_nlmsg_size(struct net_device *dev, u32 filter_mask) 121 { 122 return NLMSG_ALIGN(sizeof(struct ifinfomsg)) 123 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ 124 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ 125 + nla_total_size(4) /* IFLA_MASTER */ 126 + nla_total_size(4) /* IFLA_MTU */ 127 + nla_total_size(4) /* IFLA_LINK */ 128 + nla_total_size(1) /* IFLA_OPERSTATE */ 129 + nla_total_size(br_port_info_size()) /* IFLA_PROTINFO */ 130 + nla_total_size(br_get_link_af_size_filtered(dev, 131 filter_mask)); /* IFLA_AF_SPEC */ 132 } 133 134 static int br_port_fill_attrs(struct sk_buff *skb, 135 const struct net_bridge_port *p) 136 { 137 u8 mode = !!(p->flags & BR_HAIRPIN_MODE); 138 139 if (nla_put_u8(skb, IFLA_BRPORT_STATE, p->state) || 140 nla_put_u16(skb, IFLA_BRPORT_PRIORITY, p->priority) || 141 nla_put_u32(skb, IFLA_BRPORT_COST, p->path_cost) || 142 nla_put_u8(skb, IFLA_BRPORT_MODE, mode) || 143 nla_put_u8(skb, IFLA_BRPORT_GUARD, !!(p->flags & BR_BPDU_GUARD)) || 144 nla_put_u8(skb, IFLA_BRPORT_PROTECT, !!(p->flags & BR_ROOT_BLOCK)) || 145 nla_put_u8(skb, IFLA_BRPORT_FAST_LEAVE, !!(p->flags & BR_MULTICAST_FAST_LEAVE)) || 146 nla_put_u8(skb, IFLA_BRPORT_LEARNING, !!(p->flags & BR_LEARNING)) || 147 nla_put_u8(skb, IFLA_BRPORT_UNICAST_FLOOD, !!(p->flags & BR_FLOOD)) || 148 nla_put_u8(skb, IFLA_BRPORT_PROXYARP, !!(p->flags & BR_PROXYARP)) || 149 nla_put_u8(skb, IFLA_BRPORT_PROXYARP_WIFI, 150 !!(p->flags & BR_PROXYARP_WIFI))) 151 return -EMSGSIZE; 152 153 return 0; 154 } 155 156 static int br_fill_ifvlaninfo_range(struct sk_buff *skb, u16 vid_start, 157 u16 vid_end, u16 flags) 158 { 159 struct bridge_vlan_info vinfo; 160 161 if ((vid_end - vid_start) > 0) { 162 /* add range to skb */ 163 vinfo.vid = vid_start; 164 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_BEGIN; 165 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, 166 sizeof(vinfo), &vinfo)) 167 goto nla_put_failure; 168 169 vinfo.vid = vid_end; 170 vinfo.flags = flags | BRIDGE_VLAN_INFO_RANGE_END; 171 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, 172 sizeof(vinfo), &vinfo)) 173 goto nla_put_failure; 174 } else { 175 vinfo.vid = vid_start; 176 vinfo.flags = flags; 177 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, 178 sizeof(vinfo), &vinfo)) 179 goto nla_put_failure; 180 } 181 182 return 0; 183 184 nla_put_failure: 185 return -EMSGSIZE; 186 } 187 188 static int br_fill_ifvlaninfo_compressed(struct sk_buff *skb, 189 const struct net_port_vlans *pv) 190 { 191 u16 vid_range_start = 0, vid_range_end = 0; 192 u16 vid_range_flags = 0; 193 u16 pvid, vid, flags; 194 int err = 0; 195 196 /* Pack IFLA_BRIDGE_VLAN_INFO's for every vlan 197 * and mark vlan info with begin and end flags 198 * if vlaninfo represents a range 199 */ 200 pvid = br_get_pvid(pv); 201 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { 202 flags = 0; 203 if (vid == pvid) 204 flags |= BRIDGE_VLAN_INFO_PVID; 205 206 if (test_bit(vid, pv->untagged_bitmap)) 207 flags |= BRIDGE_VLAN_INFO_UNTAGGED; 208 209 if (vid_range_start == 0) { 210 goto initvars; 211 } else if ((vid - vid_range_end) == 1 && 212 flags == vid_range_flags) { 213 vid_range_end = vid; 214 continue; 215 } else { 216 err = br_fill_ifvlaninfo_range(skb, vid_range_start, 217 vid_range_end, 218 vid_range_flags); 219 if (err) 220 return err; 221 } 222 223 initvars: 224 vid_range_start = vid; 225 vid_range_end = vid; 226 vid_range_flags = flags; 227 } 228 229 if (vid_range_start != 0) { 230 /* Call it once more to send any left over vlans */ 231 err = br_fill_ifvlaninfo_range(skb, vid_range_start, 232 vid_range_end, 233 vid_range_flags); 234 if (err) 235 return err; 236 } 237 238 return 0; 239 } 240 241 static int br_fill_ifvlaninfo(struct sk_buff *skb, 242 const struct net_port_vlans *pv) 243 { 244 struct bridge_vlan_info vinfo; 245 u16 pvid, vid; 246 247 pvid = br_get_pvid(pv); 248 for_each_set_bit(vid, pv->vlan_bitmap, VLAN_N_VID) { 249 vinfo.vid = vid; 250 vinfo.flags = 0; 251 if (vid == pvid) 252 vinfo.flags |= BRIDGE_VLAN_INFO_PVID; 253 254 if (test_bit(vid, pv->untagged_bitmap)) 255 vinfo.flags |= BRIDGE_VLAN_INFO_UNTAGGED; 256 257 if (nla_put(skb, IFLA_BRIDGE_VLAN_INFO, 258 sizeof(vinfo), &vinfo)) 259 goto nla_put_failure; 260 } 261 262 return 0; 263 264 nla_put_failure: 265 return -EMSGSIZE; 266 } 267 268 /* 269 * Create one netlink message for one interface 270 * Contains port and master info as well as carrier and bridge state. 271 */ 272 static int br_fill_ifinfo(struct sk_buff *skb, 273 const struct net_bridge_port *port, 274 u32 pid, u32 seq, int event, unsigned int flags, 275 u32 filter_mask, const struct net_device *dev) 276 { 277 const struct net_bridge *br; 278 struct ifinfomsg *hdr; 279 struct nlmsghdr *nlh; 280 u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; 281 282 if (port) 283 br = port->br; 284 else 285 br = netdev_priv(dev); 286 287 br_debug(br, "br_fill_info event %d port %s master %s\n", 288 event, dev->name, br->dev->name); 289 290 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); 291 if (nlh == NULL) 292 return -EMSGSIZE; 293 294 hdr = nlmsg_data(nlh); 295 hdr->ifi_family = AF_BRIDGE; 296 hdr->__ifi_pad = 0; 297 hdr->ifi_type = dev->type; 298 hdr->ifi_index = dev->ifindex; 299 hdr->ifi_flags = dev_get_flags(dev); 300 hdr->ifi_change = 0; 301 302 if (nla_put_string(skb, IFLA_IFNAME, dev->name) || 303 nla_put_u32(skb, IFLA_MASTER, br->dev->ifindex) || 304 nla_put_u32(skb, IFLA_MTU, dev->mtu) || 305 nla_put_u8(skb, IFLA_OPERSTATE, operstate) || 306 (dev->addr_len && 307 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) || 308 (dev->ifindex != dev_get_iflink(dev) && 309 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev)))) 310 goto nla_put_failure; 311 312 if (event == RTM_NEWLINK && port) { 313 struct nlattr *nest 314 = nla_nest_start(skb, IFLA_PROTINFO | NLA_F_NESTED); 315 316 if (nest == NULL || br_port_fill_attrs(skb, port) < 0) 317 goto nla_put_failure; 318 nla_nest_end(skb, nest); 319 } 320 321 /* Check if the VID information is requested */ 322 if ((filter_mask & RTEXT_FILTER_BRVLAN) || 323 (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) { 324 const struct net_port_vlans *pv; 325 struct nlattr *af; 326 int err; 327 328 if (port) 329 pv = nbp_get_vlan_info(port); 330 else 331 pv = br_get_vlan_info(br); 332 333 if (!pv || bitmap_empty(pv->vlan_bitmap, VLAN_N_VID)) 334 goto done; 335 336 af = nla_nest_start(skb, IFLA_AF_SPEC); 337 if (!af) 338 goto nla_put_failure; 339 340 if (filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED) 341 err = br_fill_ifvlaninfo_compressed(skb, pv); 342 else 343 err = br_fill_ifvlaninfo(skb, pv); 344 if (err) 345 goto nla_put_failure; 346 nla_nest_end(skb, af); 347 } 348 349 done: 350 nlmsg_end(skb, nlh); 351 return 0; 352 353 nla_put_failure: 354 nlmsg_cancel(skb, nlh); 355 return -EMSGSIZE; 356 } 357 358 /* 359 * Notify listeners of a change in port information 360 */ 361 void br_ifinfo_notify(int event, struct net_bridge_port *port) 362 { 363 struct net *net; 364 struct sk_buff *skb; 365 int err = -ENOBUFS; 366 u32 filter = RTEXT_FILTER_BRVLAN_COMPRESSED; 367 368 if (!port) 369 return; 370 371 net = dev_net(port->dev); 372 br_debug(port->br, "port %u(%s) event %d\n", 373 (unsigned int)port->port_no, port->dev->name, event); 374 375 skb = nlmsg_new(br_nlmsg_size(port->dev, filter), GFP_ATOMIC); 376 if (skb == NULL) 377 goto errout; 378 379 err = br_fill_ifinfo(skb, port, 0, 0, event, 0, filter, port->dev); 380 if (err < 0) { 381 /* -EMSGSIZE implies BUG in br_nlmsg_size() */ 382 WARN_ON(err == -EMSGSIZE); 383 kfree_skb(skb); 384 goto errout; 385 } 386 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); 387 return; 388 errout: 389 rtnl_set_sk_err(net, RTNLGRP_LINK, err); 390 } 391 392 393 /* 394 * Dump information about all ports, in response to GETLINK 395 */ 396 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, 397 struct net_device *dev, u32 filter_mask, int nlflags) 398 { 399 struct net_bridge_port *port = br_port_get_rtnl(dev); 400 401 if (!port && !(filter_mask & RTEXT_FILTER_BRVLAN) && 402 !(filter_mask & RTEXT_FILTER_BRVLAN_COMPRESSED)) 403 return 0; 404 405 return br_fill_ifinfo(skb, port, pid, seq, RTM_NEWLINK, nlflags, 406 filter_mask, dev); 407 } 408 409 static int br_vlan_info(struct net_bridge *br, struct net_bridge_port *p, 410 int cmd, struct bridge_vlan_info *vinfo) 411 { 412 int err = 0; 413 414 switch (cmd) { 415 case RTM_SETLINK: 416 if (p) { 417 err = nbp_vlan_add(p, vinfo->vid, vinfo->flags); 418 if (err) 419 break; 420 421 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER) 422 err = br_vlan_add(p->br, vinfo->vid, 423 vinfo->flags); 424 } else { 425 err = br_vlan_add(br, vinfo->vid, vinfo->flags); 426 } 427 break; 428 429 case RTM_DELLINK: 430 if (p) { 431 nbp_vlan_delete(p, vinfo->vid); 432 if (vinfo->flags & BRIDGE_VLAN_INFO_MASTER) 433 br_vlan_delete(p->br, vinfo->vid); 434 } else { 435 br_vlan_delete(br, vinfo->vid); 436 } 437 break; 438 } 439 440 return err; 441 } 442 443 static int br_afspec(struct net_bridge *br, 444 struct net_bridge_port *p, 445 struct nlattr *af_spec, 446 int cmd) 447 { 448 struct bridge_vlan_info *vinfo_start = NULL; 449 struct bridge_vlan_info *vinfo = NULL; 450 struct nlattr *attr; 451 int err = 0; 452 int rem; 453 454 nla_for_each_nested(attr, af_spec, rem) { 455 if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO) 456 continue; 457 if (nla_len(attr) != sizeof(struct bridge_vlan_info)) 458 return -EINVAL; 459 vinfo = nla_data(attr); 460 if (!vinfo->vid || vinfo->vid >= VLAN_VID_MASK) 461 return -EINVAL; 462 if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) { 463 if (vinfo_start) 464 return -EINVAL; 465 vinfo_start = vinfo; 466 continue; 467 } 468 469 if (vinfo_start) { 470 struct bridge_vlan_info tmp_vinfo; 471 int v; 472 473 if (!(vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END)) 474 return -EINVAL; 475 476 if (vinfo->vid <= vinfo_start->vid) 477 return -EINVAL; 478 479 memcpy(&tmp_vinfo, vinfo_start, 480 sizeof(struct bridge_vlan_info)); 481 482 for (v = vinfo_start->vid; v <= vinfo->vid; v++) { 483 tmp_vinfo.vid = v; 484 err = br_vlan_info(br, p, cmd, &tmp_vinfo); 485 if (err) 486 break; 487 } 488 vinfo_start = NULL; 489 } else { 490 err = br_vlan_info(br, p, cmd, vinfo); 491 } 492 if (err) 493 break; 494 } 495 496 return err; 497 } 498 499 static const struct nla_policy br_port_policy[IFLA_BRPORT_MAX + 1] = { 500 [IFLA_BRPORT_STATE] = { .type = NLA_U8 }, 501 [IFLA_BRPORT_COST] = { .type = NLA_U32 }, 502 [IFLA_BRPORT_PRIORITY] = { .type = NLA_U16 }, 503 [IFLA_BRPORT_MODE] = { .type = NLA_U8 }, 504 [IFLA_BRPORT_GUARD] = { .type = NLA_U8 }, 505 [IFLA_BRPORT_PROTECT] = { .type = NLA_U8 }, 506 [IFLA_BRPORT_FAST_LEAVE]= { .type = NLA_U8 }, 507 [IFLA_BRPORT_LEARNING] = { .type = NLA_U8 }, 508 [IFLA_BRPORT_UNICAST_FLOOD] = { .type = NLA_U8 }, 509 [IFLA_BRPORT_PROXYARP] = { .type = NLA_U8 }, 510 [IFLA_BRPORT_PROXYARP_WIFI] = { .type = NLA_U8 }, 511 }; 512 513 /* Change the state of the port and notify spanning tree */ 514 static int br_set_port_state(struct net_bridge_port *p, u8 state) 515 { 516 if (state > BR_STATE_BLOCKING) 517 return -EINVAL; 518 519 /* if kernel STP is running, don't allow changes */ 520 if (p->br->stp_enabled == BR_KERNEL_STP) 521 return -EBUSY; 522 523 /* if device is not up, change is not allowed 524 * if link is not present, only allowable state is disabled 525 */ 526 if (!netif_running(p->dev) || 527 (!netif_oper_up(p->dev) && state != BR_STATE_DISABLED)) 528 return -ENETDOWN; 529 530 br_set_state(p, state); 531 br_log_state(p); 532 br_port_state_selection(p->br); 533 return 0; 534 } 535 536 /* Set/clear or port flags based on attribute */ 537 static void br_set_port_flag(struct net_bridge_port *p, struct nlattr *tb[], 538 int attrtype, unsigned long mask) 539 { 540 if (tb[attrtype]) { 541 u8 flag = nla_get_u8(tb[attrtype]); 542 if (flag) 543 p->flags |= mask; 544 else 545 p->flags &= ~mask; 546 } 547 } 548 549 /* Process bridge protocol info on port */ 550 static int br_setport(struct net_bridge_port *p, struct nlattr *tb[]) 551 { 552 int err; 553 unsigned long old_flags = p->flags; 554 555 br_set_port_flag(p, tb, IFLA_BRPORT_MODE, BR_HAIRPIN_MODE); 556 br_set_port_flag(p, tb, IFLA_BRPORT_GUARD, BR_BPDU_GUARD); 557 br_set_port_flag(p, tb, IFLA_BRPORT_FAST_LEAVE, BR_MULTICAST_FAST_LEAVE); 558 br_set_port_flag(p, tb, IFLA_BRPORT_PROTECT, BR_ROOT_BLOCK); 559 br_set_port_flag(p, tb, IFLA_BRPORT_LEARNING, BR_LEARNING); 560 br_set_port_flag(p, tb, IFLA_BRPORT_UNICAST_FLOOD, BR_FLOOD); 561 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP, BR_PROXYARP); 562 br_set_port_flag(p, tb, IFLA_BRPORT_PROXYARP_WIFI, BR_PROXYARP_WIFI); 563 564 if (tb[IFLA_BRPORT_COST]) { 565 err = br_stp_set_path_cost(p, nla_get_u32(tb[IFLA_BRPORT_COST])); 566 if (err) 567 return err; 568 } 569 570 if (tb[IFLA_BRPORT_PRIORITY]) { 571 err = br_stp_set_port_priority(p, nla_get_u16(tb[IFLA_BRPORT_PRIORITY])); 572 if (err) 573 return err; 574 } 575 576 if (tb[IFLA_BRPORT_STATE]) { 577 err = br_set_port_state(p, nla_get_u8(tb[IFLA_BRPORT_STATE])); 578 if (err) 579 return err; 580 } 581 582 br_port_flags_change(p, old_flags ^ p->flags); 583 return 0; 584 } 585 586 /* Change state and parameters on port. */ 587 int br_setlink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags) 588 { 589 struct nlattr *protinfo; 590 struct nlattr *afspec; 591 struct net_bridge_port *p; 592 struct nlattr *tb[IFLA_BRPORT_MAX + 1]; 593 int err = 0; 594 595 protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_PROTINFO); 596 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 597 if (!protinfo && !afspec) 598 return 0; 599 600 p = br_port_get_rtnl(dev); 601 /* We want to accept dev as bridge itself if the AF_SPEC 602 * is set to see if someone is setting vlan info on the bridge 603 */ 604 if (!p && !afspec) 605 return -EINVAL; 606 607 if (p && protinfo) { 608 if (protinfo->nla_type & NLA_F_NESTED) { 609 err = nla_parse_nested(tb, IFLA_BRPORT_MAX, 610 protinfo, br_port_policy); 611 if (err) 612 return err; 613 614 spin_lock_bh(&p->br->lock); 615 err = br_setport(p, tb); 616 spin_unlock_bh(&p->br->lock); 617 } else { 618 /* Binary compatibility with old RSTP */ 619 if (nla_len(protinfo) < sizeof(u8)) 620 return -EINVAL; 621 622 spin_lock_bh(&p->br->lock); 623 err = br_set_port_state(p, nla_get_u8(protinfo)); 624 spin_unlock_bh(&p->br->lock); 625 } 626 if (err) 627 goto out; 628 } 629 630 if (afspec) { 631 err = br_afspec((struct net_bridge *)netdev_priv(dev), p, 632 afspec, RTM_SETLINK); 633 } 634 635 if (err == 0) 636 br_ifinfo_notify(RTM_NEWLINK, p); 637 out: 638 return err; 639 } 640 641 /* Delete port information */ 642 int br_dellink(struct net_device *dev, struct nlmsghdr *nlh, u16 flags) 643 { 644 struct nlattr *afspec; 645 struct net_bridge_port *p; 646 int err = 0; 647 648 afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg), IFLA_AF_SPEC); 649 if (!afspec) 650 return 0; 651 652 p = br_port_get_rtnl(dev); 653 /* We want to accept dev as bridge itself as well */ 654 if (!p && !(dev->priv_flags & IFF_EBRIDGE)) 655 return -EINVAL; 656 657 err = br_afspec((struct net_bridge *)netdev_priv(dev), p, 658 afspec, RTM_DELLINK); 659 if (err == 0) 660 /* Send RTM_NEWLINK because userspace 661 * expects RTM_NEWLINK for vlan dels 662 */ 663 br_ifinfo_notify(RTM_NEWLINK, p); 664 665 return err; 666 } 667 static int br_validate(struct nlattr *tb[], struct nlattr *data[]) 668 { 669 if (tb[IFLA_ADDRESS]) { 670 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 671 return -EINVAL; 672 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 673 return -EADDRNOTAVAIL; 674 } 675 676 if (!data) 677 return 0; 678 679 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 680 if (data[IFLA_BR_VLAN_PROTOCOL]) { 681 switch (nla_get_be16(data[IFLA_BR_VLAN_PROTOCOL])) { 682 case htons(ETH_P_8021Q): 683 case htons(ETH_P_8021AD): 684 break; 685 default: 686 return -EPROTONOSUPPORT; 687 } 688 } 689 #endif 690 691 return 0; 692 } 693 694 static int br_dev_newlink(struct net *src_net, struct net_device *dev, 695 struct nlattr *tb[], struct nlattr *data[]) 696 { 697 struct net_bridge *br = netdev_priv(dev); 698 699 if (tb[IFLA_ADDRESS]) { 700 spin_lock_bh(&br->lock); 701 br_stp_change_bridge_id(br, nla_data(tb[IFLA_ADDRESS])); 702 spin_unlock_bh(&br->lock); 703 } 704 705 return register_netdevice(dev); 706 } 707 708 static int br_port_slave_changelink(struct net_device *brdev, 709 struct net_device *dev, 710 struct nlattr *tb[], 711 struct nlattr *data[]) 712 { 713 struct net_bridge *br = netdev_priv(brdev); 714 int ret; 715 716 if (!data) 717 return 0; 718 719 spin_lock_bh(&br->lock); 720 ret = br_setport(br_port_get_rtnl(dev), data); 721 spin_unlock_bh(&br->lock); 722 723 return ret; 724 } 725 726 static int br_port_fill_slave_info(struct sk_buff *skb, 727 const struct net_device *brdev, 728 const struct net_device *dev) 729 { 730 return br_port_fill_attrs(skb, br_port_get_rtnl(dev)); 731 } 732 733 static size_t br_port_get_slave_size(const struct net_device *brdev, 734 const struct net_device *dev) 735 { 736 return br_port_info_size(); 737 } 738 739 static const struct nla_policy br_policy[IFLA_BR_MAX + 1] = { 740 [IFLA_BR_FORWARD_DELAY] = { .type = NLA_U32 }, 741 [IFLA_BR_HELLO_TIME] = { .type = NLA_U32 }, 742 [IFLA_BR_MAX_AGE] = { .type = NLA_U32 }, 743 [IFLA_BR_AGEING_TIME] = { .type = NLA_U32 }, 744 [IFLA_BR_STP_STATE] = { .type = NLA_U32 }, 745 [IFLA_BR_PRIORITY] = { .type = NLA_U16 }, 746 [IFLA_BR_VLAN_FILTERING] = { .type = NLA_U8 }, 747 [IFLA_BR_VLAN_PROTOCOL] = { .type = NLA_U16 }, 748 }; 749 750 static int br_changelink(struct net_device *brdev, struct nlattr *tb[], 751 struct nlattr *data[]) 752 { 753 struct net_bridge *br = netdev_priv(brdev); 754 int err; 755 756 if (!data) 757 return 0; 758 759 if (data[IFLA_BR_FORWARD_DELAY]) { 760 err = br_set_forward_delay(br, nla_get_u32(data[IFLA_BR_FORWARD_DELAY])); 761 if (err) 762 return err; 763 } 764 765 if (data[IFLA_BR_HELLO_TIME]) { 766 err = br_set_hello_time(br, nla_get_u32(data[IFLA_BR_HELLO_TIME])); 767 if (err) 768 return err; 769 } 770 771 if (data[IFLA_BR_MAX_AGE]) { 772 err = br_set_max_age(br, nla_get_u32(data[IFLA_BR_MAX_AGE])); 773 if (err) 774 return err; 775 } 776 777 if (data[IFLA_BR_AGEING_TIME]) { 778 u32 ageing_time = nla_get_u32(data[IFLA_BR_AGEING_TIME]); 779 780 br->ageing_time = clock_t_to_jiffies(ageing_time); 781 } 782 783 if (data[IFLA_BR_STP_STATE]) { 784 u32 stp_enabled = nla_get_u32(data[IFLA_BR_STP_STATE]); 785 786 br_stp_set_enabled(br, stp_enabled); 787 } 788 789 if (data[IFLA_BR_PRIORITY]) { 790 u32 priority = nla_get_u16(data[IFLA_BR_PRIORITY]); 791 792 br_stp_set_bridge_priority(br, priority); 793 } 794 795 if (data[IFLA_BR_VLAN_FILTERING]) { 796 u8 vlan_filter = nla_get_u8(data[IFLA_BR_VLAN_FILTERING]); 797 798 err = __br_vlan_filter_toggle(br, vlan_filter); 799 if (err) 800 return err; 801 } 802 803 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 804 if (data[IFLA_BR_VLAN_PROTOCOL]) { 805 __be16 vlan_proto = nla_get_be16(data[IFLA_BR_VLAN_PROTOCOL]); 806 807 err = __br_vlan_set_proto(br, vlan_proto); 808 if (err) 809 return err; 810 } 811 #endif 812 813 return 0; 814 } 815 816 static size_t br_get_size(const struct net_device *brdev) 817 { 818 return nla_total_size(sizeof(u32)) + /* IFLA_BR_FORWARD_DELAY */ 819 nla_total_size(sizeof(u32)) + /* IFLA_BR_HELLO_TIME */ 820 nla_total_size(sizeof(u32)) + /* IFLA_BR_MAX_AGE */ 821 nla_total_size(sizeof(u32)) + /* IFLA_BR_AGEING_TIME */ 822 nla_total_size(sizeof(u32)) + /* IFLA_BR_STP_STATE */ 823 nla_total_size(sizeof(u16)) + /* IFLA_BR_PRIORITY */ 824 nla_total_size(sizeof(u8)) + /* IFLA_BR_VLAN_FILTERING */ 825 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 826 nla_total_size(sizeof(__be16)) + /* IFLA_BR_VLAN_PROTOCOL */ 827 #endif 828 0; 829 } 830 831 static int br_fill_info(struct sk_buff *skb, const struct net_device *brdev) 832 { 833 struct net_bridge *br = netdev_priv(brdev); 834 u32 forward_delay = jiffies_to_clock_t(br->forward_delay); 835 u32 hello_time = jiffies_to_clock_t(br->hello_time); 836 u32 age_time = jiffies_to_clock_t(br->max_age); 837 u32 ageing_time = jiffies_to_clock_t(br->ageing_time); 838 u32 stp_enabled = br->stp_enabled; 839 u16 priority = (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]; 840 u8 vlan_enabled = br_vlan_enabled(br); 841 842 if (nla_put_u32(skb, IFLA_BR_FORWARD_DELAY, forward_delay) || 843 nla_put_u32(skb, IFLA_BR_HELLO_TIME, hello_time) || 844 nla_put_u32(skb, IFLA_BR_MAX_AGE, age_time) || 845 nla_put_u32(skb, IFLA_BR_AGEING_TIME, ageing_time) || 846 nla_put_u32(skb, IFLA_BR_STP_STATE, stp_enabled) || 847 nla_put_u16(skb, IFLA_BR_PRIORITY, priority) || 848 nla_put_u8(skb, IFLA_BR_VLAN_FILTERING, vlan_enabled)) 849 return -EMSGSIZE; 850 851 #ifdef CONFIG_BRIDGE_VLAN_FILTERING 852 if (nla_put_be16(skb, IFLA_BR_VLAN_PROTOCOL, br->vlan_proto)) 853 return -EMSGSIZE; 854 #endif 855 856 return 0; 857 } 858 859 static size_t br_get_link_af_size(const struct net_device *dev) 860 { 861 struct net_port_vlans *pv; 862 863 if (br_port_exists(dev)) 864 pv = nbp_get_vlan_info(br_port_get_rtnl(dev)); 865 else if (dev->priv_flags & IFF_EBRIDGE) 866 pv = br_get_vlan_info((struct net_bridge *)netdev_priv(dev)); 867 else 868 return 0; 869 870 if (!pv) 871 return 0; 872 873 /* Each VLAN is returned in bridge_vlan_info along with flags */ 874 return pv->num_vlans * nla_total_size(sizeof(struct bridge_vlan_info)); 875 } 876 877 static struct rtnl_af_ops br_af_ops __read_mostly = { 878 .family = AF_BRIDGE, 879 .get_link_af_size = br_get_link_af_size, 880 }; 881 882 struct rtnl_link_ops br_link_ops __read_mostly = { 883 .kind = "bridge", 884 .priv_size = sizeof(struct net_bridge), 885 .setup = br_dev_setup, 886 .maxtype = IFLA_BR_MAX, 887 .policy = br_policy, 888 .validate = br_validate, 889 .newlink = br_dev_newlink, 890 .changelink = br_changelink, 891 .dellink = br_dev_delete, 892 .get_size = br_get_size, 893 .fill_info = br_fill_info, 894 895 .slave_maxtype = IFLA_BRPORT_MAX, 896 .slave_policy = br_port_policy, 897 .slave_changelink = br_port_slave_changelink, 898 .get_slave_size = br_port_get_slave_size, 899 .fill_slave_info = br_port_fill_slave_info, 900 }; 901 902 int __init br_netlink_init(void) 903 { 904 int err; 905 906 br_mdb_init(); 907 rtnl_af_register(&br_af_ops); 908 909 err = rtnl_link_register(&br_link_ops); 910 if (err) 911 goto out_af; 912 913 return 0; 914 915 out_af: 916 rtnl_af_unregister(&br_af_ops); 917 br_mdb_uninit(); 918 return err; 919 } 920 921 void br_netlink_fini(void) 922 { 923 br_mdb_uninit(); 924 rtnl_af_unregister(&br_af_ops); 925 rtnl_link_unregister(&br_link_ops); 926 } 927